Touch Sensor Electrode Design for Non-Square Display Boundaries
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Solution Overview
Problem
Touch sensitivity at non-square boundary portions of display devices is lower due to the standardized shape of sensor electrodes and sensor patterns, which affects the performance of touch sensors in non-traditional display shapes.
Innovation Solution
The touch sensor design includes a plurality of sensor electrodes formed in a repeated arrangement with intersecting patterns, extending over both the display area and peripheral area, with conductive patterns and dummy electrodes to enhance touch sensitivity, and an anti-reflection layer to improve visibility and reduce reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If standardized sensor electrodes and sensor patterns are used, then manufacturing is simplified, but touch sensitivity at non-square boundary portions deteriorates
Solution Approach 1:
The patent applies different sensor electrode configurations to different regions of the display. Specifically, sensor electrodes at non-square boundary portions are designed with different shapes and arrangements compared to central portions, optimizing touch sensitivity for each region while maintaining overall manufacturing feasibility through a systematic design approach
2Measurement precision
If sensor electrodes are extended to peripheral area, then touch sensitivity at non-square boundary portions is improved, but device complexity increases
Solution Approach 1:
The sensor electrode structure is divided into multiple segments including first sensor electrodes, second sensor electrodes, third sensor electrodes, and fourth sensor electrodes arranged in different regions. This segmentation allows each portion to be optimized independently for its specific function while maintaining overall system manageability
Solution Approach 2:
The patent extends sensor electrodes from the traditional display area into the peripheral area, utilizing the peripheral region as an additional dimension for improving touch sensitivity at non-square boundaries without compromising the core display functionality
3Measurement precision
If intersecting sensor patterns are used, then touch sensitivity is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent employs asymmetric sensor electrode configurations, particularly at non-square boundary portions where the sensor electrodes have different shapes and orientations compared to symmetric central portions. This asymmetric design optimizes touch sensitivity for irregular display shapes while providing clear manufacturing guidelines
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design significantly improves touch sensitivity and accuracy at non-square boundary portions by expanding the sensor patterns and conductive materials to the peripheral area, ensuring sufficient touch capacitance and clear boundary definition.
Implementation Method 1
A user can input information by pressing or touching the touch sensor while viewing an image displayed on a screen of the display device
Implementation Method 2
at least one insulating layer overlapping the display area and the peripheral area
Implementation Method 3
a conductive pattern disposed in the peripheral area and that overlaps a portion of the outermost sensor pattern. The conductive pattern is connected to the outermost sensor pattern through a contact hole
Data Source
AI summary
A display device includes a display panel including a display area in which an image is displayed and a peripheral area disposed outside of the display area, and a touch sensor disposed on the display panel. The touch sensor includes a plurality of sensor electrodes formed in a repeated arrangement of sensor patterns that forms a touch active area, a plurality of sensor wirings connected to the sensor electrodes and disposed outside of the touch active area, and at least one insulating layer overlapping the display area and the peripheral area. At least a portion of the sensor electrodes is formed over the display area and the peripheral area.